论文标题
u $ _ {7} $ te $ _ {12} $的铁磁顺序中的铁磁跨界
Ferromagnetic Crossover within the Ferromagnetic Order of U$_{7}$Te$_{12}$
论文作者
论文摘要
我们研究了铀尿素U $ _ {7} $ te $ _ {12} $的单个晶体的物理特性。我们已经确认，U $ _ {7} $ TE $ _ {12} $在六边形结构中结晶，并具有三个不需要的晶体学铀位点。据估计，在所有位置上都有均匀的力矩，估计估计每个铀位点的近1 $μ_ {\ rm b} $。铁磁相变发生在$ t _ {\ rm c} = 48 $ k，那里的平面磁化强度急剧增加，而平面外部成分并未显着增加。随着在现场冷却条件下的温度进一步降低到$ t _ {\ rm c} $，平面外部成分迅速增加左右$ t^{\ star} = 26 $K。相比之下，平面成分在$ t^{\ star} $上几乎不会变化。特定的热量测量表明在$ t^{\ star} $附近无$λ$ -Type异常，因此这是一个跨界，建议对多个铀位点上的订购矩或连续的磁性顺序进行重新定位。
We investigate the physical properties of a single crystal of uranium telluride U$_{7}$Te$_{12}$. We have confirmed that U$_{7}$Te$_{12}$ crystallizes in the hexagonal structure with three nonequivalent crystallographic uranium sites. The paramagnetic moments are estimated to be approximately 1 $μ_{\rm B}$ per the uranium site, assuming a uniform moment on all the sites. A ferromagnetic phase transition occurs at $T_{\rm C}=48$ K, where the in-plane magnetization increases sharply, whereas the out-of-plane component does not increase significantly. With decreasing temperature further below $T_{\rm C}$ under field-cooling conditions, the out-of-plane component increases rapidly around $T^{\star}=26$ K. In contrast, the in-plane component hardly changes at $T^{\star}$. Specific heat measurement indicates no $λ$-type anomaly around $T^{\star}$, so this is a cross-over suggesting a reorientation of the ordering moments or successive magnetic ordering on the part of the multiple uranium sites.
